Recently, the research team of the Changchun Institute of Optics, Fine Mechanics and Physics of the Chinese Academy of Sciences, Qu Songnan’s research group has for the first time developed hyper-carbon nanodots with strong absorption and high light-to-heat conversion efficiency in the visible-near infrared region. This work has broken through carbon-based nanomaterials. The low absorption coefficient in the near-infrared region can be seen, and a photothermal conversion efficiency of up to 53% in the near-infrared region can be achieved, which is the highest value reported for this class of materials in the world. In the development of photothermal therapeutic reagents based on carbon nanodots Has important application prospects. Carbon nanodots have many advantages such as excellent luminescent properties, good water solubility, high biocompatibility, low cost, and easy modification, and exhibit unique advantages and application prospects in the field of biomedicine. However, due to the lack of effective energy band control methods, the optical absorption of existing carbon nano-dots is mainly concentrated in the ultraviolet to blue wavelength band, and the absorption band tail extends to the near-infrared region, resulting in a low light absorption coefficient in the near-infrared region. It severely limits its practical application in the long wavelength band, especially the biological tissue optical window. In response to this problem, Qu Songnan's research group obtained a strong absorption peak in the visible-near-infrared region (λmax = 700 nm) and high light-to-heat conversion efficiency (53%) by controlling the assembly of carbon nano-dots with uneven surface charge distribution. ) Ultra-carbon nano-dot assemblies. In the super-carbon nano-dot assembly, adjacent carbon nano-dot assembly units form an assembly through possible electrostatic interactions and hydrogen bonding, thereby achieving spatial overlap and charge transfer of surface energy levels between assembly units, in visible to near The infrared region forms an independent strong absorption peak. This kind of super carbon nano-dots have good biocompatibility and have potential as a near-infrared photothermotherapy agent for photothermal therapy of tumors. This work not only obtains carbon nanodots absorbed by long wavelengths, but also provides new methods and ideas for controlling the photophysical properties of carbon nanodots. The results were published in the international optical journal "Light: Science & Applications, 2016, 5, e16120". The first author was Li Di, an associate researcher. This work was supported by the Young Scientists Project of the Chinese Academy of Sciences, the Talents and Teams Program of the Young Scientists and Young Scientists in Jilin Province, and the Major Innovation Projects of the State Key Laboratory of Luminescence and Applications.
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